KR20090129333A - Filter and display device having the same - Google Patents

Abstract

PURPOSE: A filter for a display device and the display device having the filter are provided to form a near-infrared shielding layer on one side of a transparent supporting body, and to form an electromagnetic shielding layer on the other side thereof, thereby bonding one sheet of a shielding film with a base substrate. CONSTITUTION: A shielding film(320) is composed of a single film receiving support of a single transparent supporting body. The shielding film comprises an electromagnetic shielding layer(326) on one side of the transparent supporting body heading toward a base substrate(310). A grounding bar(340) for grounding the electromagnetic shielding layer is formed on one side of the base substrate. A shielding film is adhered to a front side of the base substrate. The grounding bar is extended to a rear side along with a side from the front side of the base substrate.

Description

Filter for display device and display device provided with the filter {FILTER AND DISPLAY DEVICE HAVING THE SAME}

The present invention relates to a filter for a display device, and more particularly, to a filter for a display device and a display device having the same to implement productivity of each function in a single film to improve productivity and visibility.

As the modern society is highly informationized, video display-related parts and devices are remarkably advanced and rapidly spreading. Among them, display apparatuses for displaying images are widely used for television apparatuses, monitor apparatuses for personal computers, and the like, and thinning is progressing at the same time as these displays are enlarged.

In general, a plasma display panel (PDP) device is in the spotlight as a next-generation display device because it can satisfy both a larger size and a thinner thickness than a CRT representing a conventional display device. Such a PDP apparatus displays an image using a gas discharge phenomenon, and is excellent in various display capabilities such as display capacity, brightness, contrast, afterimage, viewing angle, and the like. In addition, PDP devices are easier to be enlarged than other display devices, and are considered to be thin display devices having the most suitable characteristics as high quality digital televisions in the future.

The PDP device generates a discharge in the gas between the electrodes by a direct current or an alternating current voltage applied to the electrode, and excites the phosphor by the radiation of ultraviolet rays, which emits light. However, the PDP device displays an image by using a gas discharge phenomenon generated when a high voltage is applied to the gas. The PDP device causes malfunctions such as electromagnetic interference (EMI) and a remote control that are harmful to a human body due to high voltage being applied. Near Infrared Ray (NIR) and orange light have disadvantages of generating neon light that adversely affects color purity.

Therefore, the PDP device employs a PDP filter having a function of shielding electromagnetic waves, shielding near infrared rays, preventing surface reflection, and / or improving color purity to shield electromagnetic waves and near infrared rays while reducing reflected light and improving color purity.

1 is a cross-sectional view showing a filter for a display device according to the prior art.

The display device filter 100 according to the related art has a structure in which a transparent substrate 110, an electromagnetic wave shielding film 120, a neon light shielding film 130, a near infrared shielding film 140, and an antireflection film 150 are stacked. Has

That is, the electromagnetic shielding film 120 is laminated on one surface of the transparent substrate 110, and the neon light shielding film 130, the near-infrared shielding film 140, and the anti-reflection film 150 are formed on the other surface by an adhesive layer. Are stacked.

Looking at the structure of each film in detail, the electromagnetic shielding film 120 is a structure in which the electromagnetic shielding layer 124 is formed on one surface of the transparent support 122, the neon light shielding film 130 of the transparent support 132 Neon light shielding layer 134 is formed on one surface, the near-infrared shielding film 140 is a structure in which the near-infrared shielding layer 144 is formed on one surface of the transparent support 142, the anti-reflection film 150 is transparent The anti-reflection layer 154 is formed on one surface of the support 152.

Such a filter for a display device according to the prior art, each film requires a transparent support (122, 132, 142, 152), the anti-reflection film, color film, electromagnetic shielding film and electromagnetic shielding film, etc. on one or the other surface of the transparent substrate, respectively Since the lamination is performed using the adhesive layer, the manufacturing process is complicated and productivity is lowered, thereby increasing the manufacturing cost.

In particular, the conventional display device filter has a structure in which a plurality of functional films having respective functions are laminated, so that it is difficult to sufficiently suppress the generation of haze, and thus there is a problem in that visibility is poor.

SUMMARY OF THE INVENTION An object of the present invention is to provide a display device filter that can implement a function on one sheet of transparent support, which can greatly shorten the production process and improve productivity and significantly reduce manufacturing costs.

Another object of the present invention is to provide a filter for a display device that can minimize the number of layers of the filter to sufficiently suppress the generation of haze and improve visibility.

Another object of the present invention is to provide a filter manufacturing method for a display apparatus, which can manufacture a filter through one process and can shorten the manufacturing process.

In order to achieve the above object, the present invention includes a base substrate, a transparent film formed on a single transparent support and a bonding layer for bonding the shielding film to the base substrate.

A grounding bar for grounding the electromagnetic shielding layer is formed on the base substrate, and the grounding bar may be any one of a conductive metal tape and a conductive metal paste.

The shielding film according to the first embodiment of the present invention comprises a transparent support, a near infrared shielding layer formed on one surface of the transparent support, and an electromagnetic shielding layer formed on the other surface of the transparent support.

The near infrared shielding layer may include a hard coating material or a color correction material.

As the electromagnetic wave shielding layer, any one of a conductive mesh pattern and a conductive film may be used. The adhesive layer is characterized by containing a conductive material.

In the method of manufacturing a filter for a display device of the present invention, a plurality of shielding layers are formed on a single transparent support to prepare a shielding film, and the adhesive film includes a conductive material through a roll-to-roll process of the shielding film. And bonding to the base substrate using.

The shielding film includes a step of preparing a transparent support, forming a near infrared shielding layer on one surface of the transparent support, and forming an electromagnetic shielding layer on the other surface of the transparent support.

The method may further include forming an anti-reflection layer on the surface of the near infrared shielding layer and including a hard coating material.

According to the above configuration, the present invention forms a near-infrared shielding layer on one surface of the transparent support, the electromagnetic wave shielding layer formed on the other surface by bonding a sheet of the shielding film to the base substrate using an adhesive layer to produce a filter As a result, the production process can be significantly shortened, improving productivity and significantly reducing manufacturing costs.

In addition, since each functional layer can be formed on one transparent support, the number of layers of the filter can be minimized to sufficiently suppress generation of haze, thereby improving visibility.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is an exploded perspective view illustrating a display device according to an embodiment of the present invention.

As shown in FIG. 2, the display device 200 according to the exemplary embodiment of the present invention includes a case 210, a cover 250 covering an upper portion of the case 210, and a drive accommodated in the case 210. The circuit board 220 includes a display panel 230 and a filter 300 including discharge cells in which gas discharge occurs.

As shown in FIG. 3, the filter 300 according to the first embodiment of the present invention is formed on the base substrate 310 and the base substrate 310, and has various shielding functions, that is, an electromagnetic shielding function and a near infrared shielding function. , A shielding film 320 for implementing a color correction function on a single transparent support, and an adhesive layer 330 for fixing the shielding film 320 to the base substrate 310.

The filter 300 according to the present embodiment is completed in one step of bonding the shielding film 320 to the base substrate 310 to implement a variety of shielding functions on a single transparent support, it can significantly shorten the manufacturing process, As a result, productivity can be improved.

Base substrate 310 is fabricated using a transparent plastic material such as tempered or semi-tempered glass or acrylic. Glass has a specific gravity of 2.6, which makes it difficult to lighten the weight of the filter and is so thick that the overall weight of the set increases when mounted on the plasma display panel. However, the glass has the advantages of preventing cracking and scattering and deterioration due to PDP emission heat when used for a long time. .

In an embodiment of the present invention, the base substrate 310 may include inorganic compound moldings such as glass and quartz and transparent organic polymer molding, but the organic polymer molding may be more preferably used because it is light and not easily broken. .

Acrylic or polycarbonate is generally used as the base substrate 310, but the present invention is not limited to these embodiments. The base substrate 310 preferably has high transparency and heat resistance, and a polymer molded product and a laminate of the polymer molded product may be used as the base substrate 310. As for the transparency of the base substrate 310, it is advantageous that the visible light transmittance is 80% or more, and in terms of heat resistance, the glass transition temperature is preferably 60 ° C or more. The polymer molding may be transparent in the visible wavelength region, and specific examples thereof include polyethylene terephthalate (PET), polysulfone (PS), polyether sulfone (PES), polystyrene, polyethylene naphthalate, polyarylate, and poly Ether ether ketone (PEEK), polycarbonate (PC), polypropylene (PP), polyimide, triacetyl cellulose (TAC), polymethyl methacrylate (PMMA), and the like, but are not limited thereto. Among them, polyethylene terephthalate (PET) is preferred in view of price, heat resistance and transparency.

A grounding bar 340 is provided at the edge of the base substrate 310 to ground the electromagnetic shielding layer 326 of the shielding film 320 to the case 210.

That is, the electromagnetic waves generated in the display panel are absorbed by the electromagnetic shielding layer 326 of the shielding film 320 before reaching the viewer, and grounded to the case through the grounding bar 340.

The grounding bar 340 may be formed of a metal tape having excellent conductivity, and copper powder or silver (Ag) powder may be applied in the form of a paste. Of course, the metal tape may be formed of copper or silver (Ag), and any metal material having excellent conductivity may be used in place of the copper powder or silver (Ag) powder.

In the case of the back ground type in which electromagnetic keys are grounded through the back of the filter, the grounding bar extends from the front of the base substrate to the back along the side. That is, when the grounding bar 340 is grounded on the back side, as shown in FIG. 3, a metal tape may be attached to the edge of the base substrate 310 in the form of a letter “c”. In this case, non-tempered glass can be used as the base substrate, which has the advantage of reducing the cost. However, even in the case of the back ground type, it is a matter of course that it is not limited to the grounding bar in the form of a metal tape.

When grounded entirely, copper powder or silver (Ag) powder may be applied to the surface of the base substrate 310 in the form of a paste.

The shielding film 320 includes a transparent support 322 serving as a base on which various shielding layers can be stacked, a near infrared shielding layer 324 stacked on one surface of the transparent support 322, and a transparent support 322. It includes an electromagnetic shielding layer 326 stacked on the other surface.

The transparent support 322 serves to support each shielding layer, and it is preferable to use a transparent resin film. As a material of the transparent support 322, for example, polyethylene terephthalate (PET), polycarbonate (PC), polyvinyl chloride (PVC), and the like may be used.

The near infrared ray shielding layer 324 may be formed directly on the surface of the transparent support 322 by a die coating method using a dye or a pigment having a near infrared ray shielding function.

The near-infrared shielding layer 324 serves to shield strong near-infrared rays generated from the display panel 230 to cause malfunction of electronic devices such as a wireless telephone or a remote controller. In addition, the near-infrared shielding layer 324 may use a polymer resin containing near-infrared absorbing dye that absorbs wavelengths in the near-infrared region to shield the near-infrared emitted from the display panel 230. For example, organic dyes of various components such as cyanine, anthraquinone, naphthoquinone, phthalocyanine, naphthalocyanine, dimonium, and nickel dithiol may be used as the near infrared absorbing dye.

The near infrared shielding layer 324 may include a hard coating material to prevent scratches. That is, the hard coating may be included in a dye or pigment having a near infrared ray shielding function to form the surface of the transparent support 322.

The near-infrared shielding layer 324 may be formed as a separate layer as described above. In addition, the near-infrared absorbing pigment may be formed in the adhesive layer 330 to absorb the wavelength of the near-infrared region.

As the electromagnetic wave shielding layer 326, a multilayer transparent conductive film in which a conductive mesh pattern or a metal thin film and a high refractive index transparent thin film are laminated may be used. Here, as the conductive mesh pattern, generally a metal mesh ground or a metal coating on a mesh of synthetic resin or metal fiber can be used. As the material of the metal constituting the conductive mesh pattern, for example, copper, chromium, nickel, silver, molybdenum, tungsten, aluminum and the like can be used as long as the metal has excellent electrical conductivity and workability.

In addition, the multilayer transparent conductive film may be a high refractive transparent thin film represented by indium tin oxide (ITO) to shield the electromagnetic waves.

Examples of the multilayer transparent conductive film include a multilayer thin film in which metal thin films such as gold, silver, copper, platinum, and palladium are alternately stacked with high refractive index transparent thin films such as indium oxide, ditin oxide, and zinc oxide.

In the embodiment of the present invention, when the electromagnetic shielding layer 326 uses a multilayer transparent conductive film in which a metal thin film and a high refractive index transparent thin film are stacked, the multilayer transparent conductive film shields near infrared rays. Therefore, in this case, two functions of shielding near infrared rays and electromagnetic waves may be performed using only the electromagnetic shielding layer 326 without separately forming the near-infrared shielding layer 324 described above. Of course, in this case, the near-infrared shielding layer 324 may be formed separately.

In the embodiment of the present invention, when the conductive mesh pattern is used as the electromagnetic shielding layer 326, a polymer resin containing a near infrared absorbing dye that absorbs wavelengths in the near infrared region may be used to shield the near infrared rays emitted from the panel assembly. have. For example, organic dyes of various components such as cyanine, anthraquinone, naphthoquinone, phthalocyanine, naphthalocyanine, dimonium, and nickel dithiol may be used as the near infrared absorbing dye.

The adhesive layer 330 is for bonding the above-described shielding film 320 to the base substrate 310, and as a specific material, an acrylic adhesive, a silicone adhesive, a urethane adhesive, a polyvinyl butyral adhesive (PMB), ethylene-acetic acid Vinyl adhesive (EVA), polyvinyl ether, saturated amorphous polyester, melamine resin, etc. are mentioned.

The adhesive layer 330 includes a conductive material for forming an electromagnetic wave emission path by electrically connecting the electromagnetic shielding layer 326 and the grounding bar 340.

That is, the adhesive layer 330 containing the conductive material is in contact with the electromagnetic shielding layer 326, and the other surface is in contact with the grounding bar 340, so that electromagnetic waves generated from the display panel 230 are electromagnetic shielding layers. Absorbed through 326 and grounded to case 210 through adhesive layer 330 and grounding bar 340. That is, the adhesive layer is applied to cover the ground bar, but includes a conductive material, and the electromagnetic shielding layer is electrically connected to the ground bar through the adhesive layer.

As another embodiment, when the adhesive layer does not contain a conductive material, the adhesive layer is applied so that the grounding bar is exposed (see FIG. 6), so that the grounding bar is in direct contact with the electromagnetic shielding layer. That is, the adhesive layer is not applied to the area where the grounding bar is formed, so that the adhesive layer does not interfere with the electrical connection between the grounding bar and the electromagnetic shielding layer.

The adhesive layer 330 may include a color correction pigment to serve as a color correction function to change or adjust the color balance by reducing or adjusting the amount of red (R), green (G), and blue (G). .

In general, red visible light generated from plasma in a display panel tends to appear orange. The color correction layer according to the prior art mainly serves to color correct the orange color having a wavelength range of 580 to 600 nm to red. However, the adhesive layer having a color correction function according to an embodiment of the present invention has a transmittance of 60% or more with respect to the orange color having a wavelength range of 580 to 600 nm, thereby reducing or excluding the role of color correction to orange color red. can do.

That is, the color correction layer according to an embodiment of the present invention is formed by adding a color correction pigment to the adhesive layer bonding the base substrate and the shielding film without being provided as a separate layer or film.

These color correction pigments use a variety of pigments to increase the color reproduction range of the display, and to improve the sharpness of the screen. As such a dye, a dye or a pigment can be used. Kinds of pigments include organic pigments having a neon light shielding function such as anthraquinone, cyanine, azo, stryl, phthalocyanine and methine, but the present invention is not limited thereto. Since the type and concentration of the dye are determined by the absorption wavelength, absorption coefficient, and transmission characteristics required in the display, the dye is not limited to a specific value and is not used.

In addition to forming a color correction dye in the adhesive layer 330 to form a color correction layer, the near-infrared shielding layer 324 may be formed by including a color correction dye.

4 is a cross-sectional view of a filter for a display device according to a second embodiment of the present invention.

The display device filter 400 according to the second embodiment has the same structure as the filter structure described in the first embodiment and further includes an anti-reflection layer 410.

The antireflection layer 410 is formed on the surface of the near infrared shielding layer 324. In other words, the anti-reflection layer 410 may be formed on the surface facing the viewer when the filter 400 is mounted on the display device, that is, on the surface opposite to the display panel 230. The anti-reflection layer 410 may improve visibility by reducing reflection of external light.

Of course, if the anti-reflection layer 410 is also formed on the surface of the filter 400 that becomes the display panel 230 side, external light reflection may be further reduced. In addition, by forming the anti-reflection layer 410 to reduce the external light reflection of the filter 400, it is possible to improve the visible light transmittance from the display panel 230 and increase the contrast ratio. In order to form the antireflection layer 410, a film having an antireflection function may be formed on the surface of the near infrared ray shielding layer 324 by coating, printing, or various conventionally known film forming methods. In addition, the transparent molded article on which the film having an antireflection function is formed or the transparent molded article having an antireflective function can be formed by pasting through any transparent pressure-sensitive adhesive or adhesive.

Specifically, the antireflection layer 410 includes a fluorine-based transparent polymer resin, a magnesium fluoride, a silicon resin, a silicon oxide thin film, or the like having a refractive index of 1.5 or less, preferably 1.4 or less, in the visible region. A single layer formed by the optical film thickness of a wavelength can be used. As the anti-reflection layer 410, two or more layers of thin films of inorganic compounds such as metal oxides, fluorides, silicides, borides, carbides, nitrides, sulfides, or organic compounds such as silicone resins, acrylic resins, and fluorine resins are used. What laminated | stacked the multilayer can be used.

Here, the antireflection layer 410 formed of a single layer is easy to manufacture, but the antireflection performance is lower than that of the multilayer layer. The multilayer stack has antireflection performance over a wide wavelength range. Such an inorganic compound thin film can be formed by conventionally known methods such as sputtering, ion plating, ion beam assist, vacuum deposition, and wet coating, and the organic compound thin film can be formed by conventionally known methods such as wet coating.

For example, the antireflection layer 410 according to an embodiment of the present invention may use a structure in which a low refractive index oxide film such as SiO ₂ and a high refractive index oxide film such as TiO ₂ or Nb ₂ O ₅ are alternately stacked. Such oxide films may be formed using physical vacuum deposition or wet coating.

5A to 5C are process flowcharts illustrating a process for manufacturing a filter for a display device according to the present invention.

First, as shown in FIG. 5A, a shielding filter 320 is manufactured. That is, the near-infrared shielding layer is formed on one surface of the transparent support 322, and the electromagnetic wave shielding layer 326 is formed on the other surface.

On one surface of the transparent support 322, a dye or pigment having a near infrared shielding function is mixed and coated with a transparent resin. In this case, a color correction pigment may be added in addition to the pigment having a near infrared ray shielding function in some cases. Then, a multilayer transparent conductive film having a conductive mesh pattern or a metal thin film and a high refractive index transparent thin film laminated on the other surface of the transparent support 322 is formed.

As shown in FIG. 5B, an anti-reflection layer 410 may be formed on the surface of the near infrared shielding layer 324 to reduce reflection of external light. The anti-reflection layer 410 may not be formed in some cases.

As such, when the manufactured shielding filter is bonded to the surface of the base substrate 310 using one adhesive layer 330 through one roll to roll process, the display filter is shown in FIG. 5C. Is completed.

Here, the adhesive layer 330 contains a conductive material that forms an electromagnetic wave emission path by electrically connecting the electromagnetic shielding layer 326 and the ground bar 324 formed on the base substrate 310. In addition, the adhesive layer 330 may include a color correction pigment. That is, the color correction pigment is included in any one of the near infrared shielding layer and the adhesive layer.

6 is a view of the shielding film according to the third embodiment of the present invention from the rear, and FIG. 7 is a view of the shielding film according to the fourth embodiment of the present invention from the rear.

As shown, the adhesive layer is applied so that the grounding bar is exposed so that the grounding bar can be in direct contact with the electromagnetic shielding layer. The shielding film of FIG. 6 is suitable for the embodiment where the grounding bar is formed at two edges of the base substrate, and the shielding film of FIG. 7 is suitable for the embodiment where the grounding bar is formed at the four edges of the base substrate.

1 is a cross-sectional view of a filter for a display device according to the prior art.

2 is an exploded perspective view of a display device according to a first embodiment of the present invention.

3 is a cross-sectional view of a filter for a display device according to a first embodiment of the present invention.

4 is a cross-sectional view of a filter for a display device according to a second embodiment of the present invention.

5A to 5C are process flowcharts of a filter for a display device according to a second embodiment of the present invention.

6 is a view of the shielding film according to the third embodiment of the present invention as viewed from the rear.

7 is a view of the shielding film according to the fourth embodiment of the present invention as viewed from the rear.

Claims (17)

A display device filter, wherein a shielding film is adhered to a base substrate by an adhesive layer. The shielding film is composed of a single film supported by a single transparent support, and a display device filter, characterized in that provided with an electromagnetic shielding layer on one surface of the transparent support facing the base substrate. The method of claim 1, The grounding bar for grounding the electromagnetic shielding layer is formed on one surface of the base substrate facing the shielding film filter for a display device. The method of claim 2, The shielding film is adhered to the front surface of the base substrate, The grounding bar is a filter for a display device, characterized in that extending from the front surface of the base substrate to the rear surface to perform the back ground. The method of claim 3, The grounding bar is a conductive metal tape, And the base substrate is non-tempered glass. The method of claim 2, The adhesive layer is applied so that the grounding bar is exposed, the grounding bar filter, characterized in that the direct contact with the electromagnetic shielding layer. The method of claim 2, The adhesive layer is applied to cover the ground bar, but including a conductive material, the electromagnetic shielding layer is a filter for a display device, characterized in that electrically connected to the ground bar through the adhesive layer. The method of claim 1, The electromagnetic wave shielding layer is a conductive film formed by directly coating on the transparent support. The method of claim 1, The electromagnetic wave shielding layer is a conductive mesh pattern formed on the transparent support. The method of claim 8, The adhesive layer is a filter for a display device, characterized in that it comprises a near-infrared shielding material. The method of claim 8, The shielding film is a filter for a display device, characterized in that it comprises a near infrared shielding layer on the other surface of the transparent support. The method of claim 10, The anti-reflection layer is laminated on one surface of the near infrared shielding layer filter for a display device. The method of claim 10, The near infrared shielding layer is a filter for a display device, characterized in that it comprises a hard coating material. The method of claim 10, The near infrared shielding layer is a filter for a display device, characterized in that it comprises a color correction material. The method of claim 1, The shielding film is a filter for a display device, characterized in that it comprises a hard coating layer on the other surface of the transparent support facing forward. The method of claim 1, The transparent support is a filter for a display device, characterized in that the transparent resin film. The method of claim 1, The adhesive layer filter for a display device, characterized in that the color correction material is included. A display panel for displaying an image; A display device comprising the filter for a display device of any one of claims 1 to 16.

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